James mackenzie



(NoModeL) J. MACKENZIE.

PORTABLE VOLTAIG BATTERY. No. 270,551. Patented Jan.9, 1883.

W/Mas, Ina/en or ITED STATES PATENT EFICE.

JAMES MACKENZIE, OF OSNABURGH STREET, COUNTY OF MIDDLESEX, ENGLAND.

PO RTABLE VOLTAIC BATTER-Y.

SPECIFICATION forming part of Letters Patent No. 270,551, dated January 9, 1853.

Application filed November 9, 1882. (No model.) Patented in England September 21, 1882, No. 4,512.

.To all whom it may concern:

Be it known that I, JAMES MACKENZIE, a citizen of England, residing at Osnaburgh Street, in the county of Middlesex, England, have invented an Improved PortableVoltaic Battery, (for which I have obtained Provisional Protection in Great Britain, No. 4,512, hearing date September 21, 1882,.) of which the following is a specification.

My invention relates to the construction and arrangement ofa chloride-of-silver batterycell so as to be powerful in its action, tight against leakage, and conveniently portable.

The accompanying drawing is a vertical section of my improved cell.

A is a cylindrical tube, of copper, brass, or other suitable metal, which is fitted at one end with a cap, 15, of the same metal, that can be screwed onto the'tube, with a ring of caoutchouc or other packing material interposed to make thejoint tight. Both the tubeAand the cap B are plated internally with silver, and on their silvered surface is fixed by fusion a layer, 1), ofchlorideofsilver. Atthe otherendofthe tube A is screwed a cover, E, made ofebonite or other suitable insulating material. Through the center of the cover E is screwed a zinc pin, F, to the externally-projectingend of which is screwed a binding-screw, O, to take one of the conducting-wires. The internal head of the zinc screw F has fixed upon it by zinc rivets a zinc tube, G, made by simply bending a strip of sheet-zinc into tubular form, so as to leave free passage for the exciting-liquid between the adjacent edges of the zinc. The zinc tube reaches nearly to the bottom of the cell, but does not touch it, and around the tube, between it and the chloride-of-silver lining, there is a clear annular space. In the cover E there is a hole fitted with a plug, H, made of silver or of ebonite or other material that will not be acted on by the exciting-liquid. Through this hole the cell can be charged, and the soundness of the joints can be tested by subjecting the cell to fluid pressure. The cell being charged with suitable exciting-liquidsuch "as solution of sodium sulphate, or of sodium chloride, or of zinc chloride-a conductingwire connected to the zincpiu F and another wire connected to the exterior of the tube A will form an external circuit for the electric current generated in the cell.

The cellconstructed as above described, having the internal surface of its tube and cap silvered and coated with cloritle of silver, and having its internal zinc tube secured to a zinc pin, presents at each electrode. only a single metal, and therefore there is no liability to any cross-polarization. As the cap and cover can be screwed tightly against packing material, the cell can be placed or carried in any attitude without the leakage of any part of its liquid contents.

Having thus described the nature of my invention and in what manner the same is to be performed, 1 claim- A portable voltaic-battery cell, consisting of .a metallic tube and tightly-closed cap internally silvered and coated with chloride of silver, in com biuation with a ti ghtl y-closed cover ofinsulating material, through which passes a zinc pin holding a zinc tube, substantially as and for the purposes herein set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 24th day of October, 1882.

JAMES MACKENZIE.

Witnesses:

OLIVER IMRAY, J OHN DEAN. 

